Application Of Frequency Control Technology In Power Plant

Frequency adjusting speed technology has in all large area made has widely application, energy-saving effect is obvious, but in high pressure motor in the application frequency technology still exists larger difficulty, this article on frequency technology area in the implementation high pressure motor frequency adjustment of theory and technology for has more of analysis, comparison existing of several high pressure frequency technology of advantages and disadvantages, eventually selected high pressure directly frequency technology on solitary North power plant boiler introduction wind machine for adjusting speed, in energy-saving of while implementation motor soft started, makes motor of run environment get significantly optimization.Also this article for high pressure motor implementation high pressure frequency technology Hou ontology temperature rose rise of problem, combination asynchronous motor of design principle and the caused motor fever of causes theory analysis, came conclusions:motor is by workers frequency run design, dang power frequency reduced Hou, set rotor magnetic field mutual role process in the produced of high times harmonic caused additional loss caused of, and under frequency and fever Zhijian of relationship, made and implementation has through adjustment motor gas gap to control temperature rose of method, actual practical indicates that effect obvious.After article half, imposed on high-voltage motor frequency conversion adjustment, protection scheme and setting criteria for analysis, rationalize protected configuration, ensure the safe operation of motor and inverter.The article Finally, carries on the summary to the frequency conversion velocity modulation technology application good and bad points:After realization frequency conversion control merit:1, The energy conservation falls consumes; Because after the frequency conversion may control the adjustment electric motor rotational speed, does not need to depend upon adjustment ways and so on original valve back plate, thus achieves the energy conservation the effect;2, Realizes the soft start; After the frequency conversion may realize the electric motor soft start, reduces to the electrical network the impact, the frequency changer electric current loses the writing up limit function, may reduce to the power source capacity request:3, Reduced machinery attrition:After uses the frequency conversion not to have needs the original valve way the adjustment current capacity. thus reduced the mechanical component attrition which the valve make and break and the pipe pressure rapid change create;4, Realization system entire automation control; The frequency changer may carry on the correspondence with other systems, the realization pressure, the current capacity, the water level entire automated controlAfter implementation frequency conversion carry-over question:In the frequency changer must carry on the high efficiency the rectification, the inversion, the result can produce the massive higher harmonics in the electric current return route, not only creates the load to give off heat, moreover can has the influence to the electrical power system and nearby electrical equipment, the popular name overtone pollution.The suppression harmonic interference already became at present affects an important attribute which the electrical network manages, because on the electrical network the overtone existence. can create the loss ascension, breakdowns and so on capacitor electric current overburning, the electric power department has also implemented the massive measures for this. like the frequency conversion system electric power supply independence, adds the reactor, the electric cable uses the armor, uses the signal shielded wire and uses special-purpose meets the grounding and so on.How reduces in the rectification inversion process produces the higher harmonic, in next period of time always will be the important topic which the technical personnel studies, will believe in the near future, along with the electric power electronic technology thorough research and the development application, this question will be able to solve gradually.